BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 7946, name: syz-executor665 3 locks held by syz-executor665/7946: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 372 hardirqs last enabled at (371): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (372): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (372): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1733 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 7946 Comm: syz-executor665 Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403550 R13: 0000000000000000 R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8058, name: syz-executor665 3 locks held by syz-executor665/8058: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 376 hardirqs last enabled at (375): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (376): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (376): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1733 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8058 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000007a0a R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8155, name: syz-executor665 3 locks held by syz-executor665/8155: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 632 hardirqs last enabled at (631): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (632): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (632): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (536): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (513): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (513): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 8155 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000007dc4 R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8354, name: syz-executor665 3 locks held by syz-executor665/8354: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 506 hardirqs last enabled at (505): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (506): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (506): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (422): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (321): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (321): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8354 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000008435 R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8683, name: syz-executor665 3 locks held by syz-executor665/8683: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 458 hardirqs last enabled at (457): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (458): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (458): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (432): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (409): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (409): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 8683 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000008e1f R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8878, name: syz-executor665 3 locks held by syz-executor665/8878: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 466 hardirqs last enabled at (465): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (466): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (466): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (332): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (291): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (291): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 8878 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009483 R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 9066, name: syz-executor665 3 locks held by syz-executor665/9066: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 610 hardirqs last enabled at (609): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (610): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (610): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (436): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (381): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (381): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 9066 Comm: syz-executor665 Tainted: G W 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffd63cdcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009ac3 R13: 00007ffd63cdccfc R14: 00007ffd63cdcd10 R15: 00007ffd63cdcd00